Null safety, Gradle issue in running

android/src/main/AndroidManifest.xml

@@ -15,7 +15,7 @@
         <!-- Indicates that app requires ARCore ("AR Required"). Causes Google
              Play Store to download and install ARCore when the app is installed.
         -->
-        <meta-data android:name="com.google.ar.core" android:value="optional" />
+        <meta-data android:name="com.google.ar.core" android:value="required" />
     </application>
 
 </manifest>

android/src/main/kotlin/com/difrancescogianmarco/arcore_flutter_plugin/ArCoreAugmentedImagesView.kt

@@ -4,8 +4,12 @@ import android.app.Activity
 import android.content.Context
 import android.graphics.Bitmap
 import android.graphics.BitmapFactory
+import android.graphics.Color
 import android.util.Log
 import android.util.Pair
+import android.view.GestureDetector
+import android.view.MotionEvent
+import com.difrancescogianmarco.arcore_flutter_plugin.flutter_models.FlutterArCoreHitTestResult
 import com.difrancescogianmarco.arcore_flutter_plugin.flutter_models.FlutterArCoreNode
 import com.difrancescogianmarco.arcore_flutter_plugin.flutter_models.FlutterArCorePose
 import com.difrancescogianmarco.arcore_flutter_plugin.utils.ArCoreUtils
@@ -25,6 +29,7 @@ import java.io.IOException
 import java.util.*
 import com.google.ar.core.exceptions.*
 import com.google.ar.core.*
+import com.google.ar.sceneform.*
 import kotlinx.coroutines.*
 import kotlin.coroutines.CoroutineContext
 
@@ -36,12 +41,25 @@ class ArCoreAugmentedImagesView(activity: Activity, context: Context, messenger:
     // the
     // database.
     private val augmentedImageMap = HashMap<Int, Pair<AugmentedImage, AnchorNode>>()
+    private val gestureDetector: GestureDetector
 
     private var job: Job = Job()
     override val coroutineContext: CoroutineContext
         get() = Dispatchers.Main + job
 
     init {
+        gestureDetector = GestureDetector(
+                context,
+                object : GestureDetector.SimpleOnGestureListener() {
+                    override fun onSingleTapUp(e: MotionEvent): Boolean {
+                        onSingleTap(e)
+                        return true
+                    }
+
+                    override fun onDown(e: MotionEvent): Boolean {
+                        return true
+                    }
+                })
 
         sceneUpdateListener = Scene.OnUpdateListener { frameTime ->
 
@@ -126,11 +144,35 @@ class ArCoreAugmentedImagesView(activity: Activity, context: Context, messenger:
          val maze_edge_size = 492.65f
          val max_image_edge = Math.max(image.extentX, image.extentZ)
          val maze_scale = max_image_edge / maze_edge_size
- 
+
          // Scale Y extra 10 times to lower the wall of maze
          mazeNode.localScale = Vector3(maze_scale, maze_scale * 0.1f, maze_scale)*//*
     }*/
 
+    private fun onSingleTap(tap: MotionEvent?) {
+        debugLog(" onSingleTap")
+        val frame = arSceneView?.arFrame
+        if (frame != null) {
+            if (tap != null && frame.camera.trackingState == TrackingState.TRACKING) {
+                val hitList = frame.hitTest(tap)
+                val list = ArrayList<HashMap<String, Any>>()
+                for (hit in hitList) {
+                    val trackable = hit.trackable
+                    if (trackable is Plane && trackable.isPoseInPolygon(hit.hitPose)) {
+                        hit.hitPose
+                        val distance: Float = hit.distance
+                        val translation = hit.hitPose.translation
+                        val rotation = hit.hitPose.rotationQuaternion
+                        val flutterArCoreHitTestResult = FlutterArCoreHitTestResult(distance, translation, rotation)
+                        val arguments = flutterArCoreHitTestResult.toHashMap()
+                        list.add(arguments)
+                    }
+                }
+                methodChannel.invokeMethod("onPlaneTap", list)
+            }
+        }
+    }
+
     override fun onMethodCall(call: MethodCall, result: MethodChannel.Result) {
         if (isSupportedDevice) {
             debugLog( call.method + "called on supported device")
@@ -171,6 +213,7 @@ class ArCoreAugmentedImagesView(activity: Activity, context: Context, messenger:
                             debugLog( "inserted ${node?.name}")
                             if (node != null) {
                                 node.setParent(anchorNode)
+                                arSceneView?.scene?.setLightEstimate(com.google.ar.sceneform.rendering.Color(255F, 255F, 255F), 0.0F)
                                 arSceneView?.scene?.addChild(anchorNode)
                                 result.success(null)
                             } else if (throwable != null) {
@@ -211,6 +254,29 @@ class ArCoreAugmentedImagesView(activity: Activity, context: Context, messenger:
 
     private fun arScenViewInit(call: MethodCall, result: MethodChannel.Result) {
         arSceneView?.scene?.addOnUpdateListener(sceneUpdateListener)
+        val enableTapRecognizer: Boolean? = call.argument("enableTapRecognizer")
+        if (enableTapRecognizer != null && enableTapRecognizer) {
+            arSceneView
+                    ?.scene
+                    ?.setOnTouchListener { hitTestResult: HitTestResult, event: MotionEvent? ->
+
+                        if (hitTestResult.node != null) {
+                            debugLog(" onNodeTap " + hitTestResult.node?.name)
+                            debugLog(hitTestResult.node?.localPosition.toString())
+                            debugLog(hitTestResult.node?.worldPosition.toString())
+                            methodChannel.invokeMethod("onNodeTap", hitTestResult.node?.name)
+                            return@setOnTouchListener true
+                        }
+                        return@setOnTouchListener gestureDetector.onTouchEvent(event)
+                    }
+        }
+
+        val enablePlaneRenderer: Boolean? = call.argument("enablePlaneRenderer")
+        if (enablePlaneRenderer != null && !enablePlaneRenderer) {
+            debugLog(" The plane renderer (enablePlaneRenderer) is set to " + enablePlaneRenderer.toString())
+            arSceneView!!.planeRenderer.isVisible = false
+        }
+
         onResume()
         result.success(null)
     }

android/src/main/kotlin/com/difrancescogianmarco/arcore_flutter_plugin/flutter_models/FlutterArCoreNode.kt

@@ -12,6 +12,8 @@ class FlutterArCoreNode(map: HashMap<String, *>) {
 
     val dartType: String = map["dartType"] as String
     val name: String = map["name"] as String
+    val isShadowReceiver: Boolean = false
+    val isShadowCaster: Boolean = false
     val image: FlutterArCoreImage? = createArCoreImage(map["image"] as? HashMap<String, *>)
     val objectUrl: String? = map["objectUrl"] as? String
     val object3DFileName: String? = map["object3DFileName"] as? String
@@ -42,6 +44,8 @@ class FlutterArCoreNode(map: HashMap<String, *>) {
         node.localPosition = position
         node.localScale = scale
         node.localRotation = rotation
+        node.renderable?.isShadowReceiver = isShadowReceiver
+        node.renderable?.isShadowCaster = isShadowCaster
 
         return node
     }

example/pubspec.lock

@@ -7,14 +7,14 @@ packages:
       path: ".."
       relative: true
     source: path
-    version: "0.1.0-null-safety.0"
+    version: "0.1.0-null-safety.3"
   async:
     dependency: transitive
     description:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.6.1"
+    version: "2.8.1"
   boolean_selector:
     dependency: transitive
     description:
@@ -35,7 +35,7 @@ packages:
       name: charcode
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.2.0"
+    version: "1.3.1"
   clock:
     dependency: transitive
     description:
@@ -94,7 +94,7 @@ packages:
       name: meta
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.3.0"
+    version: "1.7.0"
   path:
     dependency: transitive
     description:
@@ -148,7 +148,7 @@ packages:
       name: test_api
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.3.0"
+    version: "0.4.2"
   typed_data:
     dependency: transitive
     description:

lib/src/arcore_controller.dart

@@ -154,14 +154,14 @@ class ArCoreController {
 
   addArCoreNodeToAugmentedImage(ArCoreNode node, int index,
       {String? parentNodeName}) {
-    final params = _addParentNodeNameToParams(node.toMap(), parentNodeName!);
+    final params = _addParentNodeNameToParams(node.toMap(), parentNodeName);
     return _channel.invokeMethod(
         'attachObjectToAugmentedImage', {'index': index, 'node': params});
   }
 
   Future<void> addArCoreNodeWithAnchor(ArCoreNode node,
       {String? parentNodeName}) {
-    final params = _addParentNodeNameToParams(node.toMap(), parentNodeName!);
+    final params = _addParentNodeNameToParams(node.toMap(), parentNodeName);
     if (debug ?? true) {
       print(params.toString());
     }